EP2440872B1 - Procédé d'utilisation d'un système de nettoyage du fond d'un convertisseur bof - Google Patents

Procédé d'utilisation d'un système de nettoyage du fond d'un convertisseur bof Download PDF

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Publication number
EP2440872B1
EP2440872B1 EP10723541A EP10723541A EP2440872B1 EP 2440872 B1 EP2440872 B1 EP 2440872B1 EP 10723541 A EP10723541 A EP 10723541A EP 10723541 A EP10723541 A EP 10723541A EP 2440872 B1 EP2440872 B1 EP 2440872B1
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EP
European Patent Office
Prior art keywords
gas
inert gas
converter
annular gap
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10723541A
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German (de)
English (en)
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EP2440872A1 (fr
Inventor
Lutz Rose
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Group GmbH
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SMS Siemag AG
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/34—Blowing through the bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/48—Bottoms or tuyéres of converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1678—Increasing the durability of linings; Means for protecting
    • F27D1/1684—Increasing the durability of linings; Means for protecting by a special coating applied to the lining
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
    • F27D2003/163—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being an oxidant
    • F27D2003/164—Oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
    • F27D2003/165—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being a fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/166—Introducing a fluid jet or current into the charge the fluid being a treatment gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/167—Introducing a fluid jet or current into the charge the fluid being a neutral gas

Definitions

  • the invention relates to a method for operating in a distributed arrangement of a plurality of a central tube and an outer tube existing annular gap nozzles having soil flushing system of a BOF converter with inert gas injection for decarburization of the melt in the converter.
  • One of several nested nozzle tubes blowing nozzle is still through the WO 99/29913 A1 known.
  • an inert gas argon or nitrogen
  • the various gas streams are combined in a mixing zone formed above the nozzle tube outlet cross sections.
  • the flushing blocks or blocks consist of a refractory, such as ceramic material.
  • the purging blocks or blocks in turn are interspersed with nozzles in order to introduce the inert gas into the molten metal present in the converter.
  • the gas flows through the converter nozzles under high pressure and at high speed and enters the molten metal from below in the area of the converter base.
  • a stirring effect or bath movement is achieved in the melt, which compensates, inter alia, temperature differences in the molten bath.
  • the nozzles thus operate under harsh conditions, especially at their discharge end, which is permanently in contact with the molten metal. Accordingly, the nozzle is subject to high wear.
  • the burn-up or premature wear of the nozzles at their feed end is, according to experience, approximately 0.25 mm per converter charge.
  • the refractory material of the purging plug or Spülblockes in the immediate vicinity of the nozzle by the pressure and the high velocity of the injected gas also wears heavily and is concavely washed out.
  • the durability of the bottom with the purging blocks or blocks and the nozzles is based on the example of a 330t BOF converter in the range of about 4000 melts, whereas the durability of the also coated with a refractory material side walls of the converter is about 7000 melts.
  • the invention is therefore based on the object to avoid the disadvantages described above and to provide a method by which the durability of the nozzles and the purging plug or block significantly improved and thus the number of melting cycles in the converter is increased.
  • the inert gas at least temporarily together with hydrocarbon and together as a gas mixture with a supplied through the gap between the central tube and the outer tube, with the inert gas or gas mixture of the central tube reacting jacket gas with a Blowing rate ⁇ 0.045 Nm 3 / tx Min. Is injected for bath movement, wherein the annular gap nozzles circular enclosing, mushroom-shaped, porous steel shell is formed by the cladding gas at the meeting with the liquid steel.
  • the inert gas preferably argon or nitrogen, and also the hydrocarbon is injected for metallurgical treatment of the molten metal as a core jet according to the invention via the central tube or die in the molten steel, while the shell gas, in addition to hydrocarbon optionally also steam or CO 2 , as an outer ring beam blown.
  • the at the meeting Inert gas with the liquid steel then caused on the one hand bath movement and on the other hand caused cleavage of the cladding gas leads to a very energy-consuming reaction with solidification of the liquid steel in the nozzle area.
  • the diameter, for example up to 15 cm, and the height, for example up to 4 cm, of the mushroom-shaped, porous and circularly surrounding the nozzle steel shell can be varied.
  • the porous iron fungus thus covers, on the one hand, the purge block or block in the surrounding area of the nozzles, which prevents wear in the form of leaching of the refractory material.
  • the nozzles are protected by the einhausende foreclosure from burning. The only used for bath movement nozzle assembly requires only small amounts of gas, which can achieve a blow rate, which is about ⁇ 0.045 Nm 3 / tx min.
  • porous iron fungus or steel jacket forms as a batch over the top of the central inert gas nozzle during the solidification of the molten metal and thus should enforce it, advantageously a small amount of oxygen can be temporarily added to the inert gas and thereby the inert gas nozzle or the central tube be burned.
  • a further embodiment of the invention provides that each annular gap nozzle is controlled individually and a constant pressure is maintained. Should there be an increase in pressure in spite of the pressure parameters previously set in the control system, whereby both the central tube and the annular gap would become clogged, a changeover to an oxygen or inert gas admixture takes place in the control system until the previously set, constant Target pressure is reached again.
  • the sprayed slag is allowed to solidify, forming a protective layer for the refractory material in the bottom and sidewalls.
  • the inventively designed in a circular manner around the annular gap, porous, also very rough iron fungus increases in this area the surface. As well as its surface. is relatively cold, can be achieved in this way that caking of the splattered slag accelerated on the iron fungus and the adhesion is improved after cooling.
  • the Fig. 1 shows a known in the art soil rinse stone 1 of a BOF converter, not shown here for refining, mixing and / or rinsing a molten steel.
  • the floor scavenger 1 a pipe 2 as a nozzle, via which an inert gas 3, for example nitrogen, is blown for bath movement.
  • the nozzle / tube 2 is embedded in a monoblock 4, which consists of a refractory material, for example ceramic, which in turn is enclosed by the refractory material 5 of the lining of the converter.
  • a nozzle assembly is provided, which consists of an annular tube 11 from the central tube 2 and a concentric with an annular gap 8 surrounding outer tube 7.
  • the nozzle diameter of the central tube 2 does not need to be more than 5 mm and that of the annular gap nozzle 11 not more than 1 mm.
  • Inert gas 3 and intermittently hydrocarbon are injected via the central tube 2, while hydrocarbon and / or oxygen are blown through the annular gap 8 of the annular die 11 in a mixture with inert gas as the jacket gas 9.
  • the jacket gas 9 meets with the molten steel, the hydrocarbon is split. Since this reaction requires a lot of energy, a solidification of steel in the immediate vicinity 6 of the annular gap nozzle 11 is achieved.
  • a mushroom-shaped, porous steel jacket 10 forms in a circle around the annular gap nozzles 11.
  • the porous iron fungus or steel jacket 10 prevents, on the one hand, the premature wear of the refractory material of the monobloc 4, since it lies protectively over it, and, on the other hand, a burning of the tubes 2, 7 of the annular gap nozzle 11, since it surrounds them concentrically and thus towards the outside forecloses.
  • the porous iron fungus 10 enforces the central tube 2 of the annular gap nozzle 11, a small amount of oxygen can be added to the inert gas 3. Due to the added amount of oxygen and the associated reaction, the central tube 2 burns freely. For the annular gap 8 can also be driven an inert gas-oxygen mixture, if clogging appears. The oxygen thus serves only to control or form the size of the iron fungus 10.
  • an inert gas 3 eg Ar or N 2 , and (Ar + O 2 ) + (N 2 + O 2 ) can be driven.
  • the annular gap nozzles 11 of the converter are integrated into a control loop, which on the one hand individually controls and regulates each central tube 2 and the annular gap 8 and on the other hand keeps constant the pressure with which the nozzles are acted upon. Should there nevertheless be an increase in pressure above an upper limit, the annular gap 7 and / or the central tube 2 becoming clogged, then the system is driven in the mode "oxygen / inert gas" via the control loop until the target pressure is reached again.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Claims (4)

  1. Procédé pour l'exploitation d'un système de lavage du fond (100) d'un convertisseur BOF, présentant, dans un agencement distribué, plusieurs buses à fente annulaire (11) constituées par un tube central (2) et par un tube externe (7), avec insufflation d'un gaz inerte pour la décarbonisation de la masse fondue dans le convertisseur, caractérisé en ce que, via le tube central (2), en état de marche, le gaz inerte est insufflé, au moins pendant un certain temps conjointement avec un hydrocarbure, et de manière conjointe sous la forme d'un mélange gazeux avec un gaz d'enveloppe acheminé via la fente (8) ménagé entre le tube central (2) et le tube externe (7), qui réagit avec le gaz inerte respectivement avec le mélange gazeux du tube central (2), à un débit de soufflage ≤ 0,045 Nm3/t x min. pour la mise en mouvement du bain (9), procédé par lequel on obtient, via la dissociation du gaz d'enveloppe lors de sa rencontre avec l'acier liquide, la formation d'une enveloppe d'acier poreuse (10), en forme de champignon, entourant à la manière d'un cercle les buses à fente annulaire (11).
  2. Procédé selon la revendication 1, caractérisé en ce qu'on introduit par soufflage, à titre de gaz d'enveloppe, un hydrocarbure, de la vapeur d'eau ou du CO2.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'on ajoute par mélange au gaz inerte et/ou au gaz d'enveloppe, lors de l'insufflation, de manière temporaire, une quantité d'oxygène.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'on règle individuellement chaque buse à fente annulaire et on maintient une pression constante.
EP10723541A 2009-06-09 2010-06-08 Procédé d'utilisation d'un système de nettoyage du fond d'un convertisseur bof Active EP2440872B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009024859 2009-06-09
DE102010020179A DE102010020179A1 (de) 2009-06-09 2010-05-11 Verfahren zum Betreiben eines Bodenspülsystems eines BOF-Konverters
PCT/EP2010/003411 WO2010142407A1 (fr) 2009-06-09 2010-06-08 Procédé d'utilisation d'un système de nettoyage du fond d'un convertisseur bof

Publications (2)

Publication Number Publication Date
EP2440872A1 EP2440872A1 (fr) 2012-04-18
EP2440872B1 true EP2440872B1 (fr) 2013-03-20

Family

ID=43070009

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10723541A Active EP2440872B1 (fr) 2009-06-09 2010-06-08 Procédé d'utilisation d'un système de nettoyage du fond d'un convertisseur bof

Country Status (3)

Country Link
EP (1) EP2440872B1 (fr)
DE (1) DE102010020179A1 (fr)
WO (1) WO2010142407A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103591804A (zh) * 2013-11-28 2014-02-19 甘肃维新工程设备有限公司 钢结构衬砖设备衬砖的修补方法
CN106500513A (zh) * 2016-11-01 2017-03-15 云南冶金新立钛业有限公司 熔盐氯化炉和用于熔盐氯化炉的气体喷枪

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3045992A1 (de) * 1980-12-05 1982-07-22 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zum einblasen von hochsauerstoffhaltigen gasen in ein ne-metalle enthaltendes schmelzbad
JPS5819424A (ja) * 1981-07-28 1983-02-04 Kawasaki Steel Corp 転炉の炉底羽口の冷却制御法
US5431709A (en) * 1993-09-21 1995-07-11 Gas Research Institute Accretion controlling tuyere
AU1912199A (en) * 1997-12-11 1999-06-28 Quantum Catalytics, L.L.C. Feed injection device and method for control of accretion
AT412349B (de) 2003-06-25 2005-01-25 Voest Alpine Ind Anlagen Verfahren zur herstellung einer legierten metallschmelze und erzeugungsanlage hierzu

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103591804A (zh) * 2013-11-28 2014-02-19 甘肃维新工程设备有限公司 钢结构衬砖设备衬砖的修补方法
CN106500513A (zh) * 2016-11-01 2017-03-15 云南冶金新立钛业有限公司 熔盐氯化炉和用于熔盐氯化炉的气体喷枪
CN106500513B (zh) * 2016-11-01 2019-01-15 云南冶金新立钛业有限公司 熔盐氯化炉和用于熔盐氯化炉的气体喷枪

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Publication number Publication date
WO2010142407A1 (fr) 2010-12-16
EP2440872A1 (fr) 2012-04-18
DE102010020179A1 (de) 2010-12-16

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